What was found
FLAPS FAIL CAUTION WITH FLAPS AT ZERO DEGREES, 20,000 FT, 285 KTS WITH NO CREW INPUT. ACFT IS OPERATING UNDER MEL 27-50-01. MAX BTMS AFTER ZERO FLAP LANDING 9,9,10,10. NO BRAKE OVERHEAT INDICATION CHECKED RESISTANCE FROM FECU TO BPSU 17-J =1, 4952, 22-K=1.5052, 13-C=1.4552, 5-B = 1.4452, 12-A = 1.4852, 18-F = 1.4852, 23-G=1.4652, 20-H =1, 5052 END TO END MEGGAR CHECK AT 500V ALL WIRES SHOWED 0.00 MEGGER CHECK FROM PIN TO GROUND AT 500 V SHOWED OPEN AND NO BLEED OVER. REMOVED AND REPLACED RIGHT FLAP BPSU IAW AMM 27-50. INSTALLED PN 855D100-15. OPS CHECKED GOOD, R & R LEFT BRAKE AND POSITION SENSOR UNIT IAW AMM 27-51-10. OPS TEST GOOD AT TIME. A MCF IS REQ TO CONFIRM CORRECTIVE ACTION FOR PREVIOUS FLAP FAIL. ACHIEVE CRUISE ALT OF 28K FT, PERFORM SEVERAL TURNS AND ALTITUDE CHANGES. DECINED BELOW 15K FTCYCLE THE FLAPS THRU EACH INCREMENT TO FULL EXTENSION SEVERAL TIMES.